On cutting some fruits and vegetables turn brown . Explain .

Give scientific reasons Shelf life period of fruits and vegetables increases when kept in refrigerator.

Why do we eat fruits and vegetables? Do the plants also need minerals like we do?

Why does cut apple turn brown when exposed to air?

Switch off the light in your room at night for some time and then turn it on again : What did you feel when it was turned on again ?

Switch off the light in your room at night for some time and then turn it on again : Could you see the objects in the room clearly when the light was switched off ?

If a magnet is dropped through a long thick walled vertical copper tube, the magnet attains constant velocity after some time. Explain.

Manish was given aqueous solutions of silver nitrate, zinc sulphate and an iron nail. In the first experiment, he dipped iron nail in silver nitrate solution and observed that the solution turned brown. In second experiment, he dipped iron nail in zinc sulphate solution. However, no change was observed. Based on the above information, answer the following questions. Name the type of reaction that occurs when iron reacts with AgNO_3 solution.

Manish was given aqueous solutions of silver nitrate, zinc sulphate and an iron nail. In the first experiment, he dipped iron nail in silver nitrate solution and observed that the solution turned brown. In second experiment, he dipped iron nail in zinc sulphate solution. However, no change was observed. Based on the above information, answer the following questions. If he adds zinc strip in ferrous sulphate solution, what colour change will he observe?

Manish was given aqueous solutions of silver nitrate, zinc sulphate and an iron nail. In the first experiment, he dipped iron nail in silver nitrate solution and observed that the solution turned brown. In second experiment, he dipped iron nail in zinc sulphate solution. However, no change was observed. Based on the above information, answer the following questions. Will silver react with zinc sulphate solution?

Manish was given aqueous solutions of silver nitrate, zinc sulphate and an iron nail. In the first experiment, he dipped iron nail in silver nitrate solution and observed that the solution turned brown. In second experiment, he dipped iron nail in zinc sulphate solution. However, no change was observed. Based on the above information, answer the following questions. Based on your observation, arrange Ag, Zn and Fe in decreasing order of their reactivity.